Device for sharpening rock-drills.



No. 866,041. PATENTED SEPT. 17

B. LEWIS. DEVICE FOR SHARPENING ROCK DRILLS.

APPLICATION FILED JUNE 9. 1903.

1H: NoRms PETERS 50., WASHINGTON, n. c.

No. 866,041. BATENTED SEPT. 17, 1907.

B. LEWIS. DEVICE FOR SHARPBNING ROCK DRILLS.'

APPLICATION FILED TUNES. 1903.

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ELIAS LEWIS, OF DENVER, COLORADO.

DEVICE FOR SHARPEN IN G- ROCK-DRILL S.

N 0. 866,041. Specification of Letters Patent. Patented Sept. 17, 1907.

Application filed June 9. 1903- Serial No. 160,716. To all whom it may concern: with two cutting edges formed at right angles to Be it known that I, ELIAs LEwIs, a citizen of the each other, the apexes 30 of the angles pointing to- United States, residing at Denver, in the county of wards the center, point A. The sides of the cutting Denver and State of Colorado, have invented a new and edges 30, are beveled, the angle between them varying useful Device for Sharpening Rock-Drills, of which the for different kinds of drills. These sides are the swages following is a specification. I I by which the cutting edges of the drill are formed.

My invention relates to improvements in machines The lower edges of the arms 9*, extending from the for sharpening rock-drills and more particularly for the dies to the front, are sloped outwardly to allow the class of drills having four cutting edges, and being unobstructed introduction of the drill rod between the cross-shaped in section throughout their entire extent. dies, and having bevel-sided edges placed at right The object of my inventionis, to provide a machine angles to each other and adapted to engage the wings for sharpening rock-drills which, being most simple in of the drill-rod inserted between the dies, when the construction, can be manufactured at a small cost, and thickness of the steel is such that the lower edges of I the short arms 9 of levers 9 will engage the drill-rod prior to the meeting of the apexes of the four dies in the central point A. The pressure exerted by the bevel-sided edges of the arms 9 on the wings of the drill-rod will cause the metal of which they are composed, to be displaced, in consequence of which, the wings will be spread outwardly, thus producing the flaring extremity shown in Fig. 10, and which, owing to the increased resistance in heavy drill-rods, can not be produced by the swaging edges of the dies.

The dies are held in place in the slots 9, by pins 11, which are driven into the holes formed by correspondingly located semi-circular grooves in the upper surface of the dove-tailed end 30, of the dies and the adjoining surface of the grooves 9 The location of the dies in the extremities of the short arms 9, is such that, when the ends of the long arms 9 are made to diverge, and the extremities of the arms 9 in consequence converge, the apexes 30?,

time and labor, while producing satisfactory results. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 represents a plan view of my device, the upper lever being broken away. Fig. 2 is a longitudinal section taken along the line 22 Fig. 1. Fig. 3, is an enlarged sectional view of the cylinder valve. Fig. 4, is an enlarged view, partly in section of a modified form of connecting-rod. Fig. 5, is a section taken along line 55 Fig. 2, drawn to a reduced scale. Fig. 6, is a crosssection taken along the line 66 Fig. 2, showing the closed position of the dies. Fig. 7, is a reduced crosssection taken along line 77 Fig. 2, looking in the direction of the arrow, (connecting-rod, cylinder etc., omitted). Fig. 8, is an enlarged section taken along the line 88 Fig. 2. Fig. 9, is an enlarged perspective view of the lower extremity, of the short arm of one of the levers showing die in place. Fig. 10, is an enlarged perspective viewof the cutting end of a drill after having been cut and formed by my machine. Fig. 11, is an enlarged perspective view of the forked portion of the guiding standards.

Similar reference characters refer to similar parts throughout the various views.

point A, while their cutting edges 30", will meet in two straight lines, crossing each other at right angles at the point ofmeeting of the apexes.

The diverging of the ends of the long arms 9", may be accomplished in various ways, either by hand power, by the application of steam, compressed air of hydraulic power, or by other suitable means. The appliance for accomplishing the purpose, as illustrated in my drawings, is designed to be operated by either steam or compressed air. A horizontal hollow cylinder 12, mounted on a suitable base, is located beyond frame 7, its axial center line being in line with the heretofore described point A, in which the apexes 30 meet. A piston 14, with piston rod 15, has a reciprocating movement in said cylinder, the ends of the latter being closed by cylinder covers 12*, and 12 the former of which has been provided with a packing box 12, through which the piston rod passes. The end of piston rod 15, projecting outside the cylinder, is connected tanccs from a point A, while the lines of fulcrum are at right angles to each other. Bent levers 9, when in place, are at right angles to each other, the extremities of the short arms 9 being directed towards each other and towards the center point A, while the long arms 9 extend backward through and beyond frame 7. The extremities 9, of the short arms 9, are provided with dove-tailed grooves 9 into which are placed the correspondingly shaped ends 30, of dies 30.

The opposite or working ends 30 of dies 30, project ing below the ends of the short arms 9", are provided which has a reciprocating movement in angular guide 55 visable to use two or even more, depending on the vided on its 4 sides with lugs 18, to which are pivoted head 27, will form an abutment preventing the further connecting rods 19, by means of pins 18, passing through inward movement of the drill-rod, and by turning the holes in said lugs and corresponding holes in the ends bolt, the head 27, may be brought nearer to or farther of rods 19, the opposite ends of the connecting rods away from the dies, as the case may demand.

5 being pivot-ally secured to the extremities of the long Having thus described the mechanical construction 70 arms 9, oi levers 9. The connecting rods being thus oir'iiy invention, its operation is as follows; The piston, applied, form toggle joints, of which the cross head connecting rods and levers, being in the position illusconstitutes the knuckle, and by means of which the trated in broken lines in Fig. 2, the drill rod is placed long arms are forced outward when the piston is driven in the forks 24 of the standards 24, and thrust in be- 10 forward, and vice versa. A three-way valve 20, at the tween the ends of the arms 9, oi levers 9, until arrested 75 rear end of the cylinder connects the interior of cylinby bolt 27. The drill rod used, is fluted, (see Fig. 10) der 12, with the steam or air supply during the forward its wings being at right angles to each other, making the and with the atmosphere during the backward stroke rod cross-shaped in section. The position of the rod in of the piston by manipulation of the valve handle 20. between the dies is illustrated in Fig. 5, in broken lines,

the wings extending in between the adjacent cutting 80 To insure the lateral position of the long arms 9", of

levers 9, during their movement, I have provided frame edges of the dies, while the points of the dies are located in the fluted portions of the rod. The length of the 7, on its inside with 4 rectangular frames 21, two of the sides of which are secured to the sides-oi the frame cutting edges 30 of the dies should be equal to or ex- 7, while their opposite sides form guide ways 22, in ceed the distance irom the center of the drill-rod to the outer edge of the wings and the angle between the bev- 85 which the arms 9", travel.

As it is essential in the operation of my device that eled sides of the cutting edges may be varied, according to the drills. to be sharpened, some ores requiring the cutting edges 30, and apexes 30, of dies 30, meet blunter cutting edges on the drills than others. When when forming the cutting edges of the drills, it is of the the drill, which has been previously brought to a redhot state, is put in the machine, as described, the posi- 90 greatest advantage to the operator to have means for adjusting the downward movement of the arms 9,

when through long and constant use or for any other tion of the valve 20 is reversed and air or steam let in reasons, the working ends of the dies, extending beyond behind the piston, driving same forward, thereby, by the lower ends Of arms 9, have become tOO short to medium of the connecting rods, diverging the ends properly cut and form the ends of the drill rods. This of the long arms of the levers and iorcing the dies toadjustment may be accomplished by increasing the gether. The cutting edges 30, on coming together, 95 length of the piston-stroke, but, if for some reason this will separate the portion of the rod between them and should not be practical, use may bemade oi the adjustthe end of bolt 27 from the main piece, while the beveled swaging surfaces of the sides of the cutting edges will impart to the wings of the rod the required able connecting rods, illustrated in Fig. 4, and which V-shaped cutting edges. The metal displaced by the 100 consist of two short rods 19, the opposite extremities 19, of which are provided with eyes by means of which swaging, being iorced outward, will increase the width of the wings at that end of the rod, thus producing the they may be pivotally connected to the extremities of arms 9, or to the lugs 18, of cross-head 16, while their flaring end illustrated in Fig. 10.

The cutting edges 30, of the dies 30, are shown as adjacent extremities are provided with right and leit hand screw-threads and connected by .means of a turnbeveled on both sides, although only one side takes 105 active part in the forming of the drill edge.

buckle 23.

.As it is importantthat the drill rod should be fed The double edge, as illustrated, allows the reversing oi the dies, although not essential, and the cutting straight in between the cutting edges of dies 30, l have edges of the dies may be chisel-shaped if so desired.

provided my machine with one or more adjustable, forked guide, standards 24, consisting of a threaded rod 24, secured to an extension of the base 5, and a second rod 24'', the upper extremity 24, of which is forked, while its lower extremity is threaded and connected to the threadedextremity of rod 24, by means of a turnbuckle 25, which allows the lengthening and shortening of the standards to suit circumstances. The standards being in line with the center of the machine, will afford a rest for and guide the drill rod, the end of which it is desired to sharpen. Although but one of the standards is shown in the drawings, it will in many cases be ad- Having thus described my invention, what I claim is: 110

1. In a device for sharpening rock-drills, the combination with a suitable base of a frame erected thereon, four leversfulcrumed in said frame, dies secured to the converging extremities of the short arms of said levers, a cylinder located on said base, a piston having a reciprocating movement in said cylinder, means for admitting and exhausting air or steam in and from said cylinder, a piston rod secured to said piston, guide ways erected on said base, a cross head having a reciprocating movement in said guide ways, being connected with said piston-rod, 12C connecting rods pivotally connected with said cross head and with the extremities of the long arms of said levers, and suitable means for adjusting the length of said connecting rods, substantially as described.

length of the drill rod used.

One of the levers 9, is provided at a point back of the die 30, with an inwardly extending projection 26, either integral with the lever or secured thereto by bolts or other means. The extension 26, is provided at its free end with a threaded aperture for the reception of a screw-bolt 27, having an integral head 27, at one end, while it may be provided with a swiveled head or plate 27, at its opposite end nearest the die 30. When the drill-rod is thrust in between dies 30, the swiveled 2. In a device for sharpening rock-drills, the combina- 12 tion with a suitable base of two rectangular frames erected thereon, braces connecting said frames, four levers fulcrumed in one of said frames, sharpening and forming dies secured to the converging short arms of said levers, their long arms extending through and beyond said second 13 frame, means in said frame for guiding said arms, means for guiding and supporting a drill rod placed between said dies, means for limiting the inward movement of said drill rod, a steam or air cylinder, having a reciprocating piston located on said base, a cross head connected with means on said levers adapted to spread the metal, dies said piston and moving in suitable guide ways, lugs on carried by said levers, said dies bein arranged to separate said cross head, connecting rods pivoted to said lugs, the metal transversely and meet at a central point.

While their other ends are pivoted to the extremities of 7. A device of the class named, comprising in combinasaid long arms, and suitable means for lengthening or tion, a plurality of pivotally supported levers, arranged in shortening said connecting rods, substantially as described. pairs, the levers of each pair being opposite each other and having edges adapted to spread the metahand equidis ported levers arranged opposite each other, dies carried by I tantly located from a central line, dies carried by said the said levers, each having two beveled-sided cutting I levers at a point in said edges remote from their outer edges placed at right angles to each other, said dies being, extremities, said dies being arranged to separate the metal arranged to meet at a central point and separate the metal transversely and meet at a point within said central line. and means at the side of the levers and dies to support 8. A device of the class named, comprising in combina the rod being operated on, the said dies in closing upon the tion, a plurality of pivotally supportedlcvcrs, arranged in rod moving away from said supporting means, substanpairs, the levers of each pair being opposite each other and tially as described. having bevel-sided edges placed at right angles to each s therewith y from the point at Which the s o sided cutting edges, placed at right angles to each other,

together, substantially as described. said dies being arranged to separate the metal transversely 5. In combination with the swinging levers carrying the and to meet at a point in said central line. (lies, a $1501) fldjllstflbly supported y One Of the levers and In testimony whereof, I have signed my name to this movable therewith away from the Point at Which the I specification in the presence of two subscribing witnesses.

described ELIAS LEWIS.

6. A device of the class named, comprising in combina- Witnesses: tion, a. plurality of pivotally supported levers, arranged in E. C. DAWSON,

pairs, the levers of each pair being opposite each other, J- A. JACOBSON. 

